Process of making achroo-dextrin.



GEORGES REYNAUD,

' Patented. May 31, 1904.

PATENT OFFICE.

OF-PARIS, FRANCE.

PROCESS F MAKING ACHROO-DEXTRIN.

SPECIFICATION forming part of Letters Patent No; 761,542, dated May 31,1904:.

' Application filed March 3, 1904. Serial No. 196,433. (No specimens.)

T0 aZZ whom it may concern.-

Be it known that I, GEORGES REYNAUD, en-

gineer, of Rue Salneuve, in the city of Paris,

Republic of'France, have invented Improvements Relating to theManufacture of Achroo- Dextrin by the Treatment of Peat, of which thefollowing is a full, clear, and exact description. A process for thetreatment of peat for the purpose of manufacturing industrially dex trin(achroo-dextrin)vhas been described in the application for LettersPatent of the United States, Serial No. 122,817, filed by me onSeptember 10, 1902, and allowed on November 7 1903, this processconsisting in diluting the peat in twice its weight of water and in heating under pressure this dilution in an autoclave or digester at atemperature of 160 centigrade for about an hour and a half for thepurpose of converting into achroo-dextrin the amylaoeous matters of thepeat.

Experience has shown that this temperature of 160 centigrade should notbe exceeded and that this process of treatment should be appliedexclusively to neutral peats.

This invention relates to a process for the treatment of acid peats,which are much more frequent.

the influence of this temperature and of the humic acid which iscontained in the peat the amylaoeous matters of the latter begin to beconverted after about twenty minutes of treatment-in dextrin or, moreexactly, achroo-dextrin. The operation is entirely finished in about onehour and even less, if the peat is very acid. The aqueous solutionwithdrawn from the digester may then be employed directly for theindustrial exploitation of the achroodextrin, or it may be submitted toa second operation for the purpose of converting it into alcohol.

This process permits of obtaining industrially,not erythrodextrin as theprocesses ordinarily employed for the manufacture of dextrin, butdirectly achroo-dextrin capable of advantageously replacing dextrin inits industrial applications by reason of its lower density.

This process does not necessitate the pres- 'ence of any acid or otherauxiliary substance. It is extremely economical. The manipulation isconvenient and presents no danger. No special construction is requisitefor the apparatus,

which are not liable to injury and the mainto be treated in three tofive times its Weight of Water and heating this mass under a lowpressure in a digester, to a temperature of 1-10 to 150 centigradeduring half'an hour to an hour, according to the degree of acidity ofthe peat, for the purpose of converting the amylaoeous matters of thepeat into achroodextrin.

The foregoing specification of my improvements relating to themanufacture of achroodextrin by the treatment of peat signed by me this17th day of February, 1904:.

GEORGES REYNAUD.

Witnesses:

HANSON O. OoxEY, RENE THIRIOT.

